By default,the fact table's primary key is always formed by combining the superkeys pointing to the
Dimension tables to which they are related.
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Q2: Data warehouse data are organized and summarized
Q5: A data warehouse designer must define common
Q6: To provide better performance,some OLAP systems merge
Q7: The ROLLUP extension is used with the
Q8: Operational data and decision support data serve
Q9: Decision support data are a snapshot of
Q16: ROLAP and MOLAP vendors are working toward
Q18: Periodicity, usually expressed as current year only,
Q19: A star schema is designed to optimize
Q20: A data store is used by data
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